... test 70 kinds of crops printing function Test NPK, PH, organic matter, soil salinity and moisture Product description:Soil ... (Attention: above technical parameters all exceed national standards)2. PH technical parameters:Testing range: 1-14Error: ±0.13. Salinity ... 50HzDirect current: 18V, 5W (With tester) Function:Test N,P,K, PH, organic matter, soil PH, soil moisture,soil salinity, with storage ...